Worked examples
Higher-rate earner: £10,000 contribution
On a £60,000 salary, a £10,000 gross contribution gets 20% at source and roughly another 20% reclaimed — though part falls back into the basic-rate band.
£110,000 earner: the 60% band
Between £100,000 and £125,140 the personal allowance is withdrawn. A £15,000 contribution claws it back, supercharging the relief.
How pension tax relief works
When you pay into a pension, the government effectively refunds the income tax you paid on that money. Under "relief at source", you pay in from your take-home and the provider automatically adds 20% basic-rate relief. If you're a higher- or additional-rate taxpayer, you claim the extra 20% or 25% back through your tax return or tax code — it isn't added to the pension automatically, so it's easy to miss.
The 60% band
Because pension contributions reduce your "adjusted net income", paying in while you earn between £100,000 and £125,140 can restore some or all of the personal allowance you'd otherwise lose — pushing effective relief towards 60%. The calculator captures this automatically.
Mind the annual allowance
You can usually get relief on contributions up to £60,000 a year (or 100% of your earnings, if lower), including employer contributions. Very high earners see this tapered. Exceeding it can trigger a tax charge, though unused allowance from the previous three years can sometimes be carried forward.